Please help me with thses AP CHEM homework problems and show the steps to how to find the solutions:
Solid Liquid Titrations: Determine the concentration of the indicated liquid unknown given the mass of a solid standard and the buret data for the titration.
#35) What is the concentration of a potassium hydroxide solution given the following: 23.05 mL of KOH solution is required for complete reaction with 0.5346g of potassium hydrogen phthalate (KHP)? The molar mass of KHP is 204.23g.
NaOH(aq) + KHP(aq) --> NaKP(aq) + H2O(l)
#41) The concentration of a potassium permanganate (KMnO4) solution is established by titrationg a piece of iron wire that has beed previously dissolved in acid. What is the concentration of a solution of potassium permanganate given the following: 21.52 mL of the potassium permanganate solution is required for complete titration of 1.5125g of iron wire dissolved in acid.
8H+(aq) + 5Fe2+(aq) + MnO4- --> 5Fe3+(aq) + Mn2+ (aq) + 4H2O(l)
Is this the same as that posted earlier?
To find the concentration of the liquid unknown in both cases, you need to use the concept of stoichiometry and the relationship between volumes and concentrations of reactants.
Let's start with problem #35:
1. Determine the number of moles of potassium hydrogen phthalate (KHP) using its mass and molar mass.
Moles of KHP = Mass of KHP / Molar mass of KHP
2. Since the balanced chemical equation shows a 1:1 ratio between KHP and KOH, the moles of KOH required will also be equal to the moles of KHP.
3. Calculate the concentration of KOH by dividing the moles of KOH by the volume in liters (converted from mL) of KOH solution used.
Concentration of KOH = Moles of KOH / Volume of KOH solution (in liters)
Now let's move on to problem #41:
1. Determine the number of moles of iron wire using its mass and molar mass.
Moles of iron = Mass of iron wire / Molar mass of iron
2. Since the balanced chemical equation shows a 5:1 ratio between KMnO4 and iron, the moles of KMnO4 required will be five times the moles of iron.
3. Calculate the concentration of KMnO4 by dividing the moles of KMnO4 by the volume in liters (converted from mL) of KMnO4 solution used.
Concentration of KMnO4 = Moles of KMnO4 / Volume of KMnO4 solution (in liters)
Remember to pay attention to units and convert them as necessary to ensure consistency in your calculations.
By following these steps and plugging in the given values, you should be able to find the concentration of the liquid unknowns in both problems.